In situ X-ray experiment on the structure of hydrous Mg-silicate melt under high pressure and high temperature

Akihiro Yamada, Toru Inoue, Satoru Urakawa, Ken Ichi Funakoshi, Nobumasa Funamori, Takumi Kikegawa, Hiroaki Ohfuji, Tetsuo Irifune

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Abstract

Structure of a hydrous silicate melt with a forsterite-enstatite-H2O composition was investigated by in-situ X-ray diffraction with synchrotron radiation. The high temperature hydrous melt was successfully enclosed in a single-crystal diamond capsule under high pressure, up to 6.5 GPa. Results showed that the first sharp diffraction peak (FSDP), which reflects the intermediate-range structure of the complex melt, shifted drastically toward higher Q (scattering vector [Å-1]) at pressure below 2.2 GPa. This observation indicates that the silicate network in the melt was depolymerized by the influence of water molecules and partly replaced by Si-OH units under those high-pressure conditions. In contrast, between 3-5 GPa, such a peak shift was not clearly detected, suggesting that the lengthening of the intermediate-range ordering of ...-Si-O-Si-... linkage (i.e., polymerization of silicate network) occurred.

Original languageEnglish
Article numberL10303
JournalGeophysical Research Letters
Volume34
Issue number10
DOIs
Publication statusPublished - May 28 2007

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silicate melt
silicates
melt
silicate
enstatite
forsterite
x rays
experiment
capsules
diffraction
polymerization
linkages
diamond
temperature
Q factors
synchrotron radiation
diamonds
X-ray diffraction
scattering
crystal

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

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In situ X-ray experiment on the structure of hydrous Mg-silicate melt under high pressure and high temperature. / Yamada, Akihiro; Inoue, Toru; Urakawa, Satoru; Funakoshi, Ken Ichi; Funamori, Nobumasa; Kikegawa, Takumi; Ohfuji, Hiroaki; Irifune, Tetsuo.

In: Geophysical Research Letters, Vol. 34, No. 10, L10303, 28.05.2007.

Research output: Contribution to journalArticle

Yamada, Akihiro ; Inoue, Toru ; Urakawa, Satoru ; Funakoshi, Ken Ichi ; Funamori, Nobumasa ; Kikegawa, Takumi ; Ohfuji, Hiroaki ; Irifune, Tetsuo. / In situ X-ray experiment on the structure of hydrous Mg-silicate melt under high pressure and high temperature. In: Geophysical Research Letters. 2007 ; Vol. 34, No. 10.
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AU - Funakoshi, Ken Ichi

AU - Funamori, Nobumasa

AU - Kikegawa, Takumi

AU - Ohfuji, Hiroaki

AU - Irifune, Tetsuo

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